Add property and configuration option to disable the scene tag on a master node (closing #247)

include/openspace/engine/configurationmanager.h

@@ -104,6 +104,8 @@ public:
     /// The key that stores whether the master node should perform rendering just function
     /// as a pure manager
     static const std::string KeyDisableMasterRendering;
+    /// The key that stores whether the master node should apply the scene transformation
+    static const std::string KeyDisableSceneOnMaster;
     /// The key that sets the request URL that is used to request additional data to be
     /// downloaded
     static const std::string KeyDownloadRequestURL;

include/openspace/engine/openspaceengine.h

@@ -88,7 +88,8 @@ public:
     void deinitialize();
     void preSynchronization();
     void postSynchronizationPreDraw();
-    void render(const glm::mat4& viewMatrix, const glm::mat4& projectionMatrix);
+    void render(const glm::mat4& sceneMatrix, const glm::mat4& viewMatrix,
+        const glm::mat4& projectionMatrix);
     void postDraw();
     void keyboardCallback(Key key, KeyModifier mod, KeyAction action);
     void charCallback(unsigned int codepoint, KeyModifier mod);